hi,

i need help with "rounding" the numbers. example: 


use strict;
use bignum;
my $e = 0.00141;
my $o =1;
for(my $r=0; $r<=10; $r++){
        $o *=$e;
        print "$o\n";
                }

[download]
will produce : 

0.00141
0.0000019881
0.000000002803221
0.00000000000395254161
0.0000000000000055730836701
0.000000000000000007858047974841
0.00000000000000000001107984764452581
0.0000000000000000000000156225851787813921
0.000000000000000000000000022027845102081762861
0.00000000000000000000000000003105926159393528563401
0.0000000000000000000000000000000437935588474487527439541

[download]
well the problem is that i would like to deal with only max 5 numbers after the last zero in the decimal number. meaning if the number is :  0.00000000000000000000000000003105926159393528563401 than i vould like to take the number 
0.000000000000000000000000000031059

[download]
rounding the last digit (9 to 10 ->0 ; 31060) if the number after the 9 is 8 but if it is 1 or 2 like the example than 9 stays. and than deal with that number when calculating the next number in the iteration (last number in the list)

thanks

In reply to decimal precision by baxy77bax

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